Pin dependencies

install/package.json

@@ -110,17 +110,17 @@
         "zxcvbn": "^4.4.2"
     },
     "devDependencies": {
-        "coveralls": "^3.0.0",
-        "eslint": "^4.14.0",
-        "eslint-config-airbnb-base": "^12.1.0",
-        "eslint-plugin-import": "^2.8.0",
-        "grunt": "^1.0.1",
-        "grunt-contrib-watch": "^1.0.0",
-        "jsdom": "^11.5.1",
-        "mocha": "^4.1.0",
-        "mocha-lcov-reporter": "^1.3.0",
-        "nyc": "^11.4.1",
-        "smtp-server": "^3.4.1"
+        "coveralls": "3.0.1",
+        "eslint": "4.19.1",
+        "eslint-config-airbnb-base": "12.1.0",
+        "eslint-plugin-import": "2.12.0",
+        "grunt": "1.0.3",
+        "grunt-contrib-watch": "1.1.0",
+        "jsdom": "11.11.0",
+        "mocha": "4.1.0",
+        "mocha-lcov-reporter": "1.3.0",
+        "nyc": "11.9.0",
+        "smtp-server": "3.4.6"
     },
     "bugs": {
         "url": "https://github.com/NodeBB/NodeBB/issues"